Microbial species have a core genome and a pan genome. What is the difference between the two? A) The core genome consists of all the nucleic acid polymerases and translation enzymes, while the pan genome consists of all the biosynthetic pathways. B) The core genome is the set of genes within the mitochondria, while the pan genome is the set of genes in the nucleus of a species. C) The core genome is a set of genes shared by all members of a species, while the pan genome includes the core genes as well as genes that are not shared by all members. D) The core genome is the set of genes introduced by horizontal gene transfer, while the pan genome is the set of genes that is not transferred horizontally.